Alternate costumes for The Straw Hats
After unlocking Shanks and Mihawk, successfully complete the entire move set for all The Straw Hat Pirates in Training mode to unlock a third costume for them inspired by the Color Walk books. After unlocking the third Straw Hat costumes, successfully complete Grand Battle thirty times or Event Battle six times, with each of the Straw Hat crew to unlock a fourth alternate costume.

Alternate title screen
Unlock all the characters to get a new title screen that features everyone.

BMG Select
Successfully complete Event Mode with Mihawk on the hard difficulty setting to unlock the "BMG Select" at the "Treasures" menu.

Extra moves
To get extra attack add-ons for Luffy's Gum Gum Scythe attack, you must have over four fruits when using this attack. Once you attack, after your opponent hits the wall press X and you will hit your opponent in the air. Then, keep pressing X. You will do another add-on. You will hit them in the air. Then, keep pressing X. For the final attack add-on, you will hit them up again. Luffy will count down to "1" then he will yell and twist like a spiral, bounce up, and smash your opponent through the roof of the building. If you KO your opponent while doing this trick you will see the building fall around Luffy and he will say, " I'm gonna be King of the Pirates!" and you will win. Note: This trick works well with over four fruits and if your opponent health is down slightly past halfway.

Extra System Voice
Win all three rounds of Usopp's Pirates' Challenge to unlock the announcer as a System Voice.

Gallery
Successfully complete Event Battle to unlock that character's images in the gallery.

Luffy's third costume
At the "Press Start" screen, hold L, then press Up, A, Up, A, B, A(2) to unlock Luffy's third costume. In the Japanese version, hold L, then press Up(2), A, B, A(2) at the "Press Start" screen.

Marine HQ stage
After unlocking everyone, successfully complete their move lists in Training mode. After doing so, destroy all the pillars in the stage. Do this with every character to unlock the stage.

Mr. 2 Bon Clay's secret attacks
Instead of holding L and pressing A + B to use a random clone-clone attack, try the following moves to transform instead. By doing this, you can use strategy instead of luck for which character you will transform into.

Play as Buggy
Successfully complete Event Battle with Zoro to unlock Buggy.

Play as Choppy
Unlock Ms. Sunday, then successfully complete Event Battle or Story mode with Luffy, Nami, or Sanji on the hard difficulty setting to unlock Choppy.

Play as Crocodile
Unlock characters one through fifteen. Then, successfully complete Story mode on all four difficulty settings with all those characters. Then, successfully complete Story mode with Luffy on the very hard difficulty setting. When facing Crocodile, defeat him with a Secret attack to unlock him in Story mode. Successfully complete Story mode with Crocodile to unlock him in all other modes. In the Japanese version, successfully complete Event Battle with Robin.

Play as Don Crick
Successfully complete Event Battle with Sanji on the normal difficulty setting to unlock Don Crick.

Play as Enel (Japanese version)
After completing Event Battle with Luffy, Zoro, Nami, Usopp, Sanji, Chopper, and Robin, complete their move list in Training mode. A picture should flash by of Enel challenging you. Then, play a regular tournament at Grand Tours (Tournament mode). One of the character will be replaced with Enel. Defeat and win the tournament.

Play as Hawk-eyes Mihawk
Unlock Red-haired Shanks, then successfully complete Story mode with Roronoa Zolo on the very hard difficulty setting. Use a secret attack to defeat Hawk-eyes Mihawk to unlock him. In the Japanese version, successfully complete Event Battle with Zoro on the very hard difficulty setting after Shanks has been unlocked unlocked. Defeat Mihawk with a level 2 special after getting hit with Mihawk's level 2 special to unlock him.

Play as Krieg
Successfully complete Event Battle with Sanji to unlock Krieg.

Play as Kuro
Successfully complete Event Battle with Usopp to unlock Kuro.

Play as Red-haired Shanks
Unlock Tony Tony Chopper, the successfully complete Story mode with Luffy on the very hard difficulty setting to unlock Red-haired Shanks. In the Japanese version, successfully complete Event Battle with Luffy on the very hard difficulty setting after unlocking Aokiji and Enel.

Play as Smoker
Successfully complete Event Battle with Luffy to unlock Smoker.

Play as Tony Tony Chopper
Unlock Ms. Sunday, then successfully complete Story mode on the hard or greater difficulty setting with Monkey D. Luffy to unlock Tony Tony Chopper.

Play data
Successfully complete Event Battle on the very hard difficulty setting to view the stats for your battle.

Some Game Trainers are sometimes reported to be a Virus or Trojan,
the most common is a keylogger called HotKeysHook or the file
has been packed/protected with VMProtect or Themida and
is recognized as Win32/Packed.VMProtect or Win32/Packed.Themida.
In ALL cases this is a FALSE ALARM as NONE
of the Game Trainers @ GCW contain known malicious code! More info in
the PC
Games FAQ!